import java.io.*;


class FileCreator
{
  
 public static void main (String args[]) throws IOException
 {
  
    
    StringBuffer sb = new StringBuffer();
    sb.append(args[0] + ":"  + args[1] + "@" + args[2]);
    String fileName = args[3];
    
    FileWriter fw = new FileWriter(fileName);
    BufferedWriter bw = new BufferedWriter(fw);
    bw.write(sb.toString());
    bw.close();
    
  
 }
  
}